My usual white sneaker got an upgrade with these cute pink stripes. Very subtle color pink too that is perfect to dress up or down

I have been using Grans court for years. I always wear a 5 of these shoes. I ordered a new pair, and it was way too small. I ordered another one and still small. I ended having to get a 6.5. How is this possible? The material is not what my other shoes used to be. This one is too hard and very uncomfortable to wear more than 20 minutes. I wouldn't recommended if you are used to the previous shoes.